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TX08D: How to use the pulser in 4A mode?

Gaofeng Zhao
Prodigy 90 points
Part Number: TX08D

Tool/software:

Hi Ti experts,

I'm exploring how to generate a series of high-frequency waveforms (≥30MHz) using TX08D pulsers. I understand that drive current is a key parameter for increasing pulser bandwidth, but I'm unclear on how to switch between the 2A and 4A drive modes.

The documentation mentions that the LVL_PER level bit configures the output as follows: '4A drive until the AVDDP_HV_B voltage level and 2A drive from AVDDP_HV_B to AVDDP_HV_A level.' Is this how the 4A mode is implemented?

Confusingly, I expected the 4A mode to engage both transistors on the same side continuously, rather than using this phased transition approach. Could you please clarify how the current drive mode switching works and how the transition phase relates to achieving the intended peak drive currents?

Best,

Gaofeng

  • +1
    TI__Intellectual 1650 points

    Hi,

    Apologies for the delay in response. Your understanding of the 4A mode operation is correct, where both the A and B side pulsers are on together to deliver the required current. This is valid only when both the A and B side supplies are kept the same. If the supplies are kept different, say A side is greater than the B side supply, then the 4A drive will be available only until the B side supply level. For rest of the duration (difference between A and B supplies), the device will be in 2A mode. 

    Thanks and Regards

    Savyan